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  1. J

    MKV <S> don't recognize its TCQA card

    Hello All, @ ControlsGuy25 , thanks for a reply. @All , the problem was solved by replacing U80/U81 on TCQA card. Jolek.
  2. J

    MKV <S> don't recognize its TCQA card

    Hello All, I've seen a thread on a similar issue with a lot of valuable info but still need some help. In our MKV TMR F9e controller <S> found in A3 state with relays clicking frequently. A sound came from TCQA card and stopped when we refreshed ribbon cable coming from LCC/DCC. After reboot...
  3. J

    MK-V <P> question

    CSA, glenmorangie, Thank you indeed for giving a thought to an issue and spending time to write it down. Yesterday we've checked function of 20FG-1 and 20FL-1 stroking them independently and also simulated fuel changeover situation, including hydraulic oil pressure and monitoring influence on...
  4. J

    MK-V <P> question

    Hello All, What can cause all three TCEA cards of protection module <P> stop functioning, at the same moment? Theirs green LED bars stop running. Recycling power from <PD> returns them back to life and unit runs normally. We've replaced two common cards of <P> - power supply card and TCTG. No...
  5. J

    IGV, Servos and LVDT

    Hi cheedee, Once we received a brand new Moog servovalve with reversed position of upper electrical part on its body. Was the servo replaced ? If so, worth checking along with polarity. Jolek.
  6. J

    Unit trips at PMX to LL xfer during almost every shutdown

    As I already wrote in post #6 of this thread, we have a routine : once a week we start on gas, switch to liquid at FSNL or 20-25MW, go up to Base for about half an hour, go down to 20-30MW for changeover to gas, run on L-L mode for half an hour and then up to Base. Shutdown on gas. Once a week...
  7. J

    Unit trips at PMX to LL xfer during almost every shutdown

    Walt, All 14 TCs go through both outer and inner tubes and thermocouple tip located at the center of the inner tube. We assemble/dissassemble/change these TCs A LOT - every CI, HGPI, Major, chamber repair or inspection,...and we have 4 units equipped with these TCs, so you can imagine how much...
  8. J

    Unit trips at PMX to LL xfer during almost every shutdown

    Walt, Here are pics of Crossfire TC. An HGPI is scheduled for this unit at July, so it's difficult to organize endcover opening, especially these coronavirus days when amount of people is down to minimum. CSA, Still hot on me... If you would have read carefully my very first message you...
  9. J

    Unit trips at PMX to LL xfer during almost every shutdown

    Waltrobinson, As for me, I've been sure that all machines of this type in the world are equipped with Crossfire tube thermocouples! Those units we have originally were liqiud oil fuelled only. Than, about 10 years ago, we had an upgrade to dual fuel done by Ansaldo-Thomassen. I don't know what...
  10. J

    Unit trips at PMX to LL xfer during almost every shutdown

    CSA, I've been really surprized by your last post on this thread. Even shocked. For several years I follow your answers and explanations to many colleagues and find them very helpful and contributing, sometimes reread them and even save some interesting points. And I REALLY appreciate your...
  11. J

    Unit trips at PMX to LL xfer during almost every shutdown

    Thank you, CSA. A little bit more info and corrections. First of all, tripping CTXF temperature with sort 5 sec delay is 1100 Deg Celsius, not Fahrenheit. You just misread it. So, reading of temperature higher than 1100 Deg C goes negative ( - 1133 DegC ). In order to MKV not consider this...
  12. J

    Unit trips at PMX to LL xfer during almost every shutdown

    CSA, Thanks for a quick, as usual, responce! Sorry for confusion, I supposed to have written "latter" instead of "latest", and still probably I'm not very clear. I meant that unit trips from second logical option - 5 sec of very high CTXF temperature, above 1100 DegC. To emphasize again -...
  13. J

    Unit trips at PMX to LL xfer during almost every shutdown

    Our 9E DLN1 unit trips at PMX to LL xfer during almost every shutdown. We have CTXF thermocouples installed in crossfire tubes and a logic that trips the unit if one of them senses temperature higher than CTDA + 32 DegC for about a minute, or if one of them senses overranged temperature - above...
  14. J

    3AO1 and 3AO2 Thermocouple

    These are 3rd Stage Thermocouples, located on the left (3AO1) and right (3AO2) side downstream. There names minted on turbine body near the insertion holes.
  15. J

    9FA GT Exhaust Thermocouple Heads Breaking

    You must fasten ALL connections on TC routs so TC will not tremble.
  16. J

    Mixed Fuel Mode Operation

    Thank you, CSA! Those small grammar mistakes don't bother me at all. Myself, as English is not my first (and not a second, and not a third) language, surely making such terrible mistakes that I'm really glad someone can get to the point of a problem I'm trying to share and describe :)...
  17. J

    Mixed Fuel Mode Operation

    Thank you for your reply, CSA. "I&T" is a typo - I meant I&C (Instrument and Control Maintenance). We've considered changing check valves with pneumatic valves but this solution was dropped exactly because of reasons you've mentioned - cost, additional hardware in already "clogged" area in...
  18. J

    Mixed Fuel Mode Operation

    Hello, We have several Frame 9E units. Sometimes we're tripping at Gas-to-Liquid changeover, which we perform once per week or two. Usually, the problem is fuel pipes and other volumes not completely filled with liquid fuel. By slowing rate of changeover from 30 sec to 5-10 times more...
  19. J

    Wheelspace Thermocouple Exact Location

    First number is Stage number. Last number 1 is left turbine side downstream, 2 is right turbine side downstream.
  20. J

    GE Speed Control Loop

    Hello, How Droop Control handles Summer/Winter output margin? For instance, we have about 20 MW difference between hot and cold seasons. That means Base Load may change a lot and there are the same 4% for Droop SP Regulation.
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